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Cell-2022 for Fridge4
V.Zavjalov, Jun-Sep 2022

After explosion of cell-2020 a new one has been made in a very similar way. Nuclear stage plates, mixing chamber heat exchngers, and heat switch are taken from the old cell.

inner cells (paper + Stycast-1266), 23.06.2022

new inner cells, silver wires, nuclear stage plates from outer cell, old inner cells

silver wires after annealing

welding silver wires to nuclear stage plates for the outer cell, 12.07.2022

welding silver wires to nuclear stage plates for inner cells, 15.07.2022

nuclear stage blocks for inner cells

all nuclear stage blocks

inner cell with windows for installing vibrating wires

inner cells: nuclear stage and aerogel sample installed

installing filling lines for inner cells (copper cappilary, ID=0.22, OD=0.5, L=400mm)

cells are glued together

cell lids are closed, 19.07.2022

tantalum vibrating wires for inner cells

13 um vibrating wires (bolometer heaters)

installing 13um wires to bolometer boxes

4.5um wires (bolometer thermometers)

bolometer boxes with 0.5mm hole in PET wall and two vibrating wires in each

bolometer box 1 with a lid above the hole, 22.07.2022

example of a pad with two vibrating wires (4um and 0.315um)

installing wires to inner cells

Araldite parts for the outer cell and GRP cover for 20mK shield (made in university workshop)

Nb shield for heat switch magnet and coil former for compensation coil

making compensation coil, 29.07.2022

heat switch magnet with Nb shield and compensation coil

old heat switch with mixing chamber flange, heat switch magnet

start making connector panel for mixing chamber flange

pressure gauge before installing to mixing chamber flange

connector holder and pressure gauge on the mixing chamber flange

new connector for mixing chamber vibrating wire and fork

connector panel

other side

new design of vibrating wires

NbTi threads and bonded to PCB with Al wire (thanks to Dima and Mike)

pad with 180nm and 315nm wires

all vibrating wires are installed, leak testing inner cells, 13.08.2022

bottom side of inner cells, bolometer boxes and filling lines

nuclear stage for the outer cell

start assembling outer cell

top side

bottom side

new cell holder

bottom flange of outer cell and Macor rod

tantalum wire for the outer cell

closing top side of the outer cell

closing bottom side of the outer cell

arranging wires

cell volume measurement

before welding silver wires between nuclear stage and heat switch

welding is done, 29.08.2022

finish soldering of the connector plate

cell heaters (40um Eureca wire)

heaters wrapped in Ag plates

heaters mounted on the cell

welded connecton of compensation coil wires (NbTi in coper matrix -> NbTi in CuNi matrix)

connector for compensation coil (Nb plates welded to inner core of superconductive wire)

before installing cell to the cryostat

cell installed to the cryostat, all lines connected 02.09.2022

20mK sheild and Macor spacer